ENCYCLOPEDIA

PRAXI′DICE (Praxidikê), i. e. the goddess who carries out the objects of justice, or watches that justice is done to men. When Menelaus arrived in Laconia, on his return from Troy, he set up a statue of Praxidice near Gytheium, not far from the spot where Paris, in carrying off Helen, had founded a sanctuary of Aphrodite Migonitis (Paus. iii. 22. § 2). Near Haliartus, in Boeotia, we meet with the worship of Praxidicae, in the plural (ix. 33. § 2), who were called daughters of Ogyges, and their names are Alalcomenia, Thelxinoea, and Auilis (ix. 33. § 4; Suid. s. v.; Steph. Byz. s. v. Tremilê). Their images consisted merely of heads, and their sacrifices only of the heads of animals. With the Orphic poets Praxidice seems to be a surname of Persephone. (Orph. Argon. 31, Hymn. 28. 5.)

Suidas s.v. Praxidike (trans. Suda On Line) (Byzantine Greek Lexicon C10th A.D.) :
"Praxidike (Exacter of Justice): A deity whose head alone is venerated. Mnaseas [Greek C2nd B.C.] in his treatise On Europe says that Soter (Saviour) and his sister Praxidike (Exacter of Justice) had a son Ktesios (Household) and daughters Homonoia and Arete, who were called Praxidikai (Exacters of Penalties) after their mother."